Abstract
The purpose of the present study was to evaluate the in vitro seal capability of interim post and core crown restorations. Eighty teeth were selected and divided into 8 groups. Four experimental groups received interim posts and core crowns. Half of each group was decoronated at the cementum-enamel junction, groups PCCH and PCZO. The other half was sectioned 2 mm coronal to the cementum-enamel junction, groups PCrZO and PCrCH. The interim post and core crowns were luted with Rely X Temp NE, groups PCrZO and PCZO; Hydro C was used for Groups PCrCH and PCCH. The control groups, PC and PCr, received uncoated post and core crowns; groups OTg and OT were left without interim post and core crowns and were totally open. Infiltration was accessed by dye exposure followed by demineralization of the teeth. The length of the infiltration was measured using digital images taken from the specimens. The images were inserted into the Image Tool 3.0 software. Kruskal-Wallis analysis of variance and Dunn's multiple comparison method were used to test for significant differences among test groups (P < .05). Groups PCrZO and PCrCH showed the least dye penetration, followed by groups PCZO and PCCH. Teeth restored with interim post and core crowns will be subject to leakage. Ethics Committee: 095/2008.
Highlights
As control groups do not represent any clinical situation in practice, a non-parametric statistical test, the Kruskal-Wallis 1-way ANOVA by ranks test (P < 0.001), was applied only to the experimental groups to provide more statistical power to the study
Significant differences were found for the experimental groups
The coronal tooth structure above the crown margin together with luted post and core crowns promoted a better seal. This is probably due to the more extended line of cement provided by the 2 mm of coronal tooth structure, causing the interim post and core crown to have a “hugging action”
Summary
Coronal leakage has been cited as a primary cause of inflammatory periradicular pathosis due to the penetration of bacteria into the pulp space,[1,2] greater emphasis has been placed on the quality of final and interim restorations.[3,4] Delay in placing a restoration, fracture of a restoration, post space preparation, or restoration failure are some of the causes for loss of coronal seal after endodontic therapy.[5]Custom made posts remain an integral component of the prosthodontics treatment,[6,7,8] especially when extensive loss of coronal tooth structure is found, and the classic extracoronal ferrule effect is suitable to improve the structural integrity of the pulpless tooth.[9]. Should the criteria for construction and marginal accuracy be respected, but should be regarded as important to seal the root canal system.[11]
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